diff --git a/l10n/ca/viewer.ftl b/l10n/ca/viewer.ftl
index b071af423cbd4..ca6746fa19088 100644
--- a/l10n/ca/viewer.ftl
+++ b/l10n/ca/viewer.ftl
@@ -118,6 +118,9 @@ pdfjs-document-properties-subject = Assumpte:
 pdfjs-document-properties-keywords = Paraules clau:
 pdfjs-document-properties-creation-date = Data de creació:
 pdfjs-document-properties-modification-date = Data de modificació:
+# Variables:
+#   $dateObj (Date) - the creation/modification date and time of the PDF file
+pdfjs-document-properties-date-time-string = { DATETIME($dateObj, dateStyle: "short", timeStyle: "medium") }
 pdfjs-document-properties-creator = Creador:
 pdfjs-document-properties-producer = Generador de PDF:
 pdfjs-document-properties-version = Versió de PDF:
@@ -161,6 +164,9 @@ pdfjs-digital-signature-properties-view-certificate = Mostra el certificat
 #                      could not be verified.
 pdfjs-digital-signature-properties-reason = Motiu: { $reason }
 # Variables:
+#   $dateObj (Date) - the signing time from the /Sig dict's /M entry.
+pdfjs-digital-signature-properties-timestamp = Marca horària: { DATETIME($dateObj, dateStyle: "short", timeStyle: "medium") }
+# Variables:
 #   $count (Number) - number of nested sub-signatures (one per earlier
 #                     incremental revision of the document).
 pdfjs-digital-signature-properties-sub-signatures =
@@ -197,6 +203,10 @@ pdfjs-thumb-page-canvas =
     .aria-label = Miniatura de la pàgina { $page }
 # Variables:
 #   $page (Number) - the page number
+pdfjs-thumb-page-checkbox1 =
+    .title = Selecciona la pàgina { $page }
+# Variables:
+#   $page (Number) - the page number
 #   $total (Number) - the number of pages
 pdfjs-thumb-page-title1 =
     .title = Pàgina { $page } de { $total }
@@ -269,6 +279,9 @@ pdfjs-rendering-error = S'ha produït un error mentre es renderitzava la pàgina
 # Some common types are e.g.: "Check", "Text", "Comment", "Note"
 pdfjs-text-annotation-type =
     .alt = [Anotació { $type }]
+# Variables:
+#   $dateObj (Date) - the modification date and time of the annotation
+pdfjs-annotation-date-time-string = { DATETIME($dateObj, dateStyle: "short", timeStyle: "medium") }
 
 ## Password
 
@@ -300,12 +313,23 @@ pdfjs-highlight-floating-button1 =
     .aria-label = Ressalta
     .title = Ressalta
 pdfjs-highlight-floating-button-label = Ressalta
+pdfjs-comment-floating-button =
+    .aria-label = Comentari
+    .title = Comentari
+pdfjs-comment-floating-button-label = Comentari
+pdfjs-editor-comment-button =
+    .aria-label = Comentari
+    .title = Comentari
+pdfjs-editor-comment-button-label = Comentari
 pdfjs-editor-signature-button =
     .title = Afegeix una signatura
 pdfjs-editor-signature-button-label = Afegeix una signatura
 
 ## Default editor aria labels
 
+# “Highlight” is a noun, the string is used on the editor for highlights.
+pdfjs-editor-highlight-editor =
+    .aria-label = Editor de ressaltat
 # “Drawing” is a noun, the string is used on the editor for drawings.
 pdfjs-editor-ink-editor =
     .aria-label = Editor de dibuix
@@ -343,6 +367,8 @@ pdfjs-editor-stamp-add-image-button =
 pdfjs-editor-stamp-add-image-button-label = Afegeix una imatge
 # This refers to the thickness of the line used for free highlighting (not bound to text)
 pdfjs-editor-free-highlight-thickness-input = Gruix
+pdfjs-editor-free-highlight-thickness-title =
+    .title = Canvia el gruix en ressaltar elements diferents del text
 pdfjs-editor-add-signature-container =
     .aria-label = Controls de signatura i signatures desades
 pdfjs-editor-signature-add-signature-button =
@@ -369,6 +395,8 @@ pdfjs-editor-comments-sidebar-close-button =
     .aria-label = Tanca la barra lateral
     .title = Tanca la barra lateral
 pdfjs-editor-comments-sidebar-close-button-label = Tanca la barra lateral
+# Instructional copy to add a comment by selecting text or an annotations.
+pdfjs-editor-comments-sidebar-no-comments1 = Hi veieu alguna cosa destacable? Ressalteu-la i deixeu-hi un comentari.
 pdfjs-editor-comments-sidebar-no-comments-link = Més informació
 
 ## Alt-text dialog
@@ -392,6 +420,26 @@ pdfjs-editor-alt-text-textarea =
 pdfjs-editor-alt-text-button =
     .aria-label = Text alternatiu
 
+## Editor resizers
+## This is used in an aria label to help to understand the role of the resizer.
+
+pdfjs-editor-resizer-top-left =
+    .aria-label = Cantonada superior esquerra — canvia la mida
+pdfjs-editor-resizer-top-middle =
+    .aria-label = Part superior central — canvia la mida
+pdfjs-editor-resizer-top-right =
+    .aria-label = Cantonada superior dreta — canvia la mida
+pdfjs-editor-resizer-middle-right =
+    .aria-label = Part dreta central — canvia la mida
+pdfjs-editor-resizer-bottom-right =
+    .aria-label = Cantonada inferior dreta — canvia la mida
+pdfjs-editor-resizer-bottom-middle =
+    .aria-label = Part inferior central — canvia la mida
+pdfjs-editor-resizer-bottom-left =
+    .aria-label = Cantonada inferior esquerra — canvia la mida
+pdfjs-editor-resizer-middle-left =
+    .aria-label = Part esquerra central — canvia la mida
+
 ## Color picker
 
 # This means "Color used to highlight text"
@@ -437,20 +485,58 @@ pdfjs-editor-new-alt-text-not-now-button = Ara no
 pdfjs-editor-new-alt-text-error-title = No s'ha pogut crear el text alternatiu automàticament
 pdfjs-editor-new-alt-text-error-description = Escriviu el vostre propi text alternatiu o proveu més tard.
 pdfjs-editor-new-alt-text-error-close-button = Tanca
+# Variables:
+#   $totalSize (Number) - the total size (in MB) of the AI model.
+#   $downloadedSize (Number) - the downloaded size (in MB) of the AI model.
+pdfjs-editor-new-alt-text-ai-model-downloading-progress = S'està baixant el model d'IA de text alternatiu ({ $downloadedSize } de { $totalSize } MB)
+    .aria-valuetext = S'està baixant el model d'IA de text alternatiu ({ $downloadedSize } de { $totalSize } MB)
 # This is a button that users can click to edit the alt text they have already added.
 pdfjs-editor-new-alt-text-added-button =
     .aria-label = Text alternatiu afegit.
 pdfjs-editor-new-alt-text-added-button-label = Text alternatiu afegit.
+# This is a button that users can click to open the alt text editor and add alt text when it is not present.
+pdfjs-editor-new-alt-text-missing-button =
+    .aria-label = Falta el text alternatiu
+pdfjs-editor-new-alt-text-missing-button-label = Falta el text alternatiu
+# This is a button that opens up the alt text modal where users should review the alt text that was automatically generated.
+pdfjs-editor-new-alt-text-to-review-button =
+    .aria-label = Revisa el text alternatiu
+pdfjs-editor-new-alt-text-to-review-button-label = Revisa el text alternatiu
+# "Created automatically" is a prefix that will be added to the beginning of any alt text that has been automatically generated. After the colon, the user will see/hear the actual alt text description. If the alt text has been edited by a human, this prefix will not appear.
+# Variables:
+#   $generatedAltText (String) - the generated alt-text.
+pdfjs-editor-new-alt-text-generated-alt-text-with-disclaimer = Creat automàticament: { $generatedAltText }
 
 ## Image alt-text settings
 
+pdfjs-image-alt-text-settings-button =
+    .title = Paràmetres del text alternatiu de la imatge
+pdfjs-image-alt-text-settings-button-label = Paràmetres del text alternatiu de la imatge
+pdfjs-editor-alt-text-settings-dialog-label = Paràmetres del text alternatiu de la imatge
+pdfjs-editor-alt-text-settings-automatic-title = Text alternatiu automàtic
+pdfjs-editor-alt-text-settings-create-model-button-label = Crea el text alternatiu automàticament
+pdfjs-editor-alt-text-settings-create-model-description = Suggereix descripcions per ajudar les persones que no poden veure la imatge o quan la imatge no es carrega.
+pdfjs-editor-alt-text-settings-editor-title = Editor de text alternatiu
+pdfjs-editor-alt-text-settings-show-dialog-button-label = Mostra l'editor de text alternatiu immediatament en afegir una imatge
+pdfjs-editor-alt-text-settings-show-dialog-description = Us ajuda a assegurar-vos que totes les imatges tenen text alternatiu.
 pdfjs-editor-alt-text-settings-close-button = Tanca
 
+## Accessibility labels (announced by screen readers) for objects added to the editor.
+
+pdfjs-editor-highlight-added-alert = S'ha afegit el ressaltat
+pdfjs-editor-freetext-added-alert = S'ha afegit el text
+pdfjs-editor-ink-added-alert = S'ha afegit el dibuix
+pdfjs-editor-stamp-added-alert = S'ha afegit la imatge
+pdfjs-editor-signature-added-alert = S'ha afegit la signatura
+
 ## "Annotations removed" bar
 
+pdfjs-editor-undo-bar-message-highlight = S'ha eliminat el ressaltat
+pdfjs-editor-undo-bar-message-freetext = S'ha eliminat el text
 pdfjs-editor-undo-bar-message-ink = S'ha eliminat el dibuix
 pdfjs-editor-undo-bar-message-stamp = S'ha eliminat la imatge
 pdfjs-editor-undo-bar-message-signature = S’ha eliminat la signatura
+pdfjs-editor-undo-bar-message-comment = S'ha eliminat el comentari
 # Variables:
 #   $count (Number) - the number of removed annotations.
 pdfjs-editor-undo-bar-message-multiple =
@@ -465,17 +551,55 @@ pdfjs-editor-undo-bar-close-button =
     .title = Tanca
 pdfjs-editor-undo-bar-close-button-label = Tanca
 
+## Add a signature dialog
+
+pdfjs-editor-add-signature-dialog-label = Aquest diàleg modal permet a l'usuari crear una signatura per a afegir-la a un document PDF. L'usuari pot editar el nom (que també serveix com a text alternatiu) i, opcionalment, desar la signatura per a fer-la servir més vegades.
+pdfjs-editor-add-signature-dialog-title = Afegeix una signatura
+
 ## Tab names
 
 # Type is a verb (you can type your name as signature)
 pdfjs-editor-add-signature-type-button = Tipus
     .title = Tipus
+# Draw is a verb (you can draw your signature)
+pdfjs-editor-add-signature-draw-button = Dibuixa
+    .title = Dibuixa
 pdfjs-editor-add-signature-image-button = Imatge
     .title = Imatge
 
+## Tab panels
+
+pdfjs-editor-add-signature-type-input =
+    .aria-label = Escriviu la vostra signatura
+    .placeholder = Escriviu la vostra signatura
+pdfjs-editor-add-signature-draw-placeholder = Dibuixeu la signatura
+pdfjs-editor-add-signature-draw-thickness-range-label = Gruix
+# Variables:
+#   $thickness (Number) - the thickness (in pixels) of the line used to draw a signature.
+pdfjs-editor-add-signature-draw-thickness-range =
+    .title = Gruix del dibuix: { $thickness }
+pdfjs-editor-add-signature-image-placeholder = Arrossegueu un fitxer aquí per a pujar-lo
+pdfjs-editor-add-signature-image-browse-link =
+    { PLATFORM() ->
+        [macos] O trieu fitxers d'imatge
+       *[other] O navegueu pels fitxers d'imatge
+    }
+
 ## Controls
 
+pdfjs-editor-add-signature-description-label = Descripció (text alternatiu)
+pdfjs-editor-add-signature-description-input =
+    .title = Descripció (text alternatiu)
+pdfjs-editor-add-signature-description-default-when-drawing = Signatura
+pdfjs-editor-add-signature-clear-button-label = Neteja la signatura
+pdfjs-editor-add-signature-clear-button =
+    .title = Neteja la signatura
 pdfjs-editor-add-signature-save-checkbox = Desa la signatura
+pdfjs-editor-add-signature-save-warning-message = Heu arribat al límit de 5 signatures desades. Elimineu-ne una per a desar-ne una altra.
+pdfjs-editor-add-signature-image-upload-error-title = No s'ha pogut pujar la imatge
+pdfjs-editor-add-signature-image-upload-error-description = Comproveu la connexió de xarxa o proveu amb una altra imatge.
+pdfjs-editor-add-signature-image-no-data-error-title = No es pot convertir aquesta imatge en una signatura
+pdfjs-editor-add-signature-image-no-data-error-description = Proveu de penjar una imatge diferent.
 pdfjs-editor-add-signature-error-close-button = Tanca
 
 ## Dialog buttons
@@ -487,6 +611,8 @@ pdfjs-editor-edit-signature-update-button = Actualitza
 ## Comment popup
 
 pdfjs-editor-edit-comment-popup-button-label = Edita el comentari
+pdfjs-editor-edit-comment-popup-button =
+    .title = Edita el comentari
 pdfjs-editor-delete-comment-popup-button-label = Elimina el comentari
 pdfjs-editor-delete-comment-popup-button =
     .title = Elimina el comentari
@@ -498,9 +624,18 @@ pdfjs-show-comment-button =
 # An existing comment is edited
 pdfjs-editor-edit-comment-dialog-title-when-editing = Edita el comentari
 pdfjs-editor-edit-comment-dialog-save-button-when-editing = Actualitza
+# No existing comment
+pdfjs-editor-edit-comment-dialog-title-when-adding = Afegeix un comentari
 pdfjs-editor-edit-comment-dialog-save-button-when-adding = Afegeix
+pdfjs-editor-edit-comment-dialog-text-input =
+    .placeholder = Comenceu a escriure...
 pdfjs-editor-edit-comment-dialog-cancel-button = Cancel·la
 
+## Edit a comment button in the editor toolbar
+
+pdfjs-editor-add-comment-button =
+    .title = Afegeix un comentari
+
 ## The view manager is a sidebar displaying different views:
 ##  - thumbnails;
 ##  - outline;
@@ -508,36 +643,138 @@ pdfjs-editor-edit-comment-dialog-cancel-button = Cancel·la
 ##  - layers.
 ## The thumbnails view is used to edit the pdf: remove/insert pages, ...
 
+pdfjs-toggle-views-manager-notification-button =
+    .title = Commuta la barra lateral (el document conté miniatures, esquema, adjuncions o capes)
 pdfjs-toggle-views-manager-button1-label = Gestiona les pàgines
 pdfjs-views-manager-sidebar =
     .aria-label = Barra lateral
+pdfjs-views-manager-sidebar-resizer =
+    .aria-label = Redimensionador de la barra lateral
 pdfjs-views-manager-view-selector-button =
     .title = Vistes
 pdfjs-views-manager-view-selector-button-label = Vistes
 pdfjs-views-manager-pages-title = Pàgines
+pdfjs-views-manager-outlines-title1 = Esquema del document
+    .title = Esquema del document (feu doble clic per a desplegar o plegar tots els elements)
+pdfjs-views-manager-attachments-title = Adjuncions
 pdfjs-views-manager-layers-title1 = Capes
     .title = Capes (doble clic per a restablir totes les capes a l'estat per defecte)
 pdfjs-views-manager-pages-option-label = Pàgines
+pdfjs-views-manager-outlines-option-label = Esquema del document
+pdfjs-views-manager-attachments-option-label = Adjuncions
 pdfjs-views-manager-layers-option-label = Capes
+pdfjs-views-manager-add-file-button =
+    .title = Afegeix un fitxer
 pdfjs-views-manager-add-file-button-label = Afegeix un fitxer
+# Variables:
+#   $count (Number) - the number of selected pages.
+pdfjs-views-manager-pages-status-action-label =
+    { $count ->
+        [one] { $count } seleccionada
+       *[other] { $count } seleccionades
+    }
+pdfjs-views-manager-pages-status-none-action-label = Selecciona les pàgines
+pdfjs-views-manager-pages-status-action-button-label = Gestiona
 pdfjs-views-manager-pages-status-copy-button-label = Copia
 pdfjs-views-manager-pages-status-cut-button-label = Retalla
 pdfjs-views-manager-pages-status-delete-button-label = Suprimeix
+pdfjs-views-manager-pages-status-export-selected-button-label = Exporta les seleccionades...
+# Variables:
+#   $count (Number) - the number of selected pages to be cut.
+pdfjs-views-manager-status-undo-cut-label =
+    { $count ->
+        [one] 1 pàgina retallada
+       *[other] { $count } pàgines retallades
+    }
+# Variables:
+#   $count (Number) - the number of selected pages to be copied.
+pdfjs-views-manager-pages-status-undo-copy-label =
+    { $count ->
+        [one] S'ha copiat 1 pàgina
+       *[other] S'han copiat { $count } pàgines
+    }
+# Variables:
+#   $count (Number) - the number of selected pages to be deleted.
+pdfjs-views-manager-pages-status-undo-delete-label =
+    { $count ->
+        [one] S'ha suprimit 1 pàgina
+       *[other] S'han suprimit { $count } pàgines
+    }
+pdfjs-views-manager-pages-status-waiting-ready-label = S'està preparant el fitxer...
+pdfjs-views-manager-pages-status-waiting-uploading-label = S'està pujant el fitxer...
+pdfjs-views-manager-status-warning-cut-label = No s'ha pogut retallar. Actualitzeu la pàgina i proveu-ho de nou.
+pdfjs-views-manager-status-warning-copy-label = No s'ha pogut copiar. Actualitzeu la pàgina i proveu-ho de nou.
+pdfjs-views-manager-status-warning-delete-label = No s'ha pogut suprimir. Actualitzeu la pàgina i proveu-ho de nou.
+pdfjs-views-manager-status-warning-save-label = No s'ha pogut desar. Actualitzeu la pàgina i proveu-ho de nou.
+pdfjs-views-manager-status-undo-button-label = Desfés
+pdfjs-views-manager-status-done-button-label = Fet
 pdfjs-views-manager-status-close-button =
     .title = Tanca
+pdfjs-views-manager-status-close-button-label = Tanca
+pdfjs-views-manager-paste-button-label = Enganxa
+pdfjs-views-manager-paste-button-before =
+    .title = Enganxa abans de la primera pàgina
+# Variables:
+#   $page (Number) - the page number after which the paste button is.
+pdfjs-views-manager-paste-button-after =
+    .title = Enganxa després de la pàgina { $page }
+# Badge used to promote a new feature in the UI, keep it as short as possible.
+# It's spelled uppercase for English, but it can be translated as usual.
+pdfjs-new-badge-content = NOU
+pdfjs-views-manager-waiting-for-file = S'està pujant el fitxer...
+pdfjs-toggle-views-manager-button1 =
+    .title = Gestiona les pàgines
 
 ## Digital signature properties (signature verification panel)
 
 pdfjs-digital-signature-properties-button =
     .aria-label = Propietats de la signatura digital
     .title = Propietats de la signatura digital
+pdfjs-digital-signature-properties-button-label = Propietats de la signatura digital
+
+## Banner shown above the signature list summarising the overall
+## verification state of the document. Each variant is selected by the
+## viewer based on the worst per-signature status; one signature is
+## enough to lower the banner.
+##
+## Variables:
+##   $count (Number) - number of signatures at the worst level.
+
+pdfjs-digital-signature-properties-banner-verified = El document s'ha signat amb una signatura digital vàlida
+pdfjs-digital-signature-properties-banner-unknown =
+    { $count ->
+        [one] Document signat, però no s'ha pogut verificar { $count } signatura digital
+       *[other] El document està signat, però no s'han pogut verificar { $count } signatures digitals
+    }
+pdfjs-digital-signature-properties-banner-untrusted =
+    { $count ->
+        [one] Document signat amb { $count } certificat que no és de confiança
+       *[other] Document signat amb { $count } certificats que no són de confiança
+    }
+pdfjs-digital-signature-properties-banner-expired =
+    { $count ->
+        [one] Document signat amb { $count } certificat caducat
+       *[other] Document signat amb { $count } certificats caducats
+    }
+pdfjs-digital-signature-properties-banner-invalid =
+    { $count ->
+        [one] El document té { $count } signatura digital no vàlida
+       *[other] El document té { $count } signatures digitals no vàlides
+    }
+pdfjs-digital-signature-properties-banner-revoked =
+    { $count ->
+        [one] Document signat amb { $count } certificat revocat
+       *[other] Document signat amb { $count } certificats revocats
+    }
 
 ## Per-signature status row. Only three distinct strings are needed:
 ## the signature crypto either verified (the cert chain may still be
 ## untrusted/expired/revoked, but that's surfaced on the cert row
 ## below), or it failed, or its sub-format isn't supported.
 
+pdfjs-digital-signature-properties-status-verified = Estat: signatura verificada
 pdfjs-digital-signature-properties-status-invalid = Estat: signatura no vàlida
+pdfjs-digital-signature-properties-status-unknown = Estat: no es pot verificar (no compatible)
 
 ## Per-signature certificate row. The variants with an issuer / date in
 ## parentheses embed fully-localized context — no English fall-through.
@@ -546,6 +783,14 @@ pdfjs-digital-signature-properties-status-invalid = Estat: signatura no vàlida
 ##   $issuer (String) - issuer or subject common name from the cert.
 ##   $dateObj (Date)  - notAfter date for the expired-with-date form.
 
+pdfjs-digital-signature-properties-certificate-trusted = Certificat: de confiança ({ $issuer })
+pdfjs-digital-signature-properties-certificate-unknown = Certificat: no disponible
+pdfjs-digital-signature-properties-certificate-untrusted = Certificat: no és de confiança
+pdfjs-digital-signature-properties-certificate-untrusted-unknown-issuer = Certificat: emissor desconegut ({ $issuer })
+pdfjs-digital-signature-properties-certificate-untrusted-self-signed = Certificat: autosignat ({ $issuer })
+pdfjs-digital-signature-properties-certificate-untrusted-untrusted-issuer = Certificat: emissor no fiable ({ $issuer })
+pdfjs-digital-signature-properties-certificate-expired = Certificat: caducat
+pdfjs-digital-signature-properties-certificate-expired-with-date = Certificat: caducat ({ DATETIME($dateObj, dateStyle: "medium") })
 pdfjs-digital-signature-properties-certificate-revoked = Certificat: revocat
 
 ## Main menu for adding/removing signatures
diff --git a/l10n/hr/viewer.ftl b/l10n/hr/viewer.ftl
index f7d63d249e96a..9f2b825b95bf6 100644
--- a/l10n/hr/viewer.ftl
+++ b/l10n/hr/viewer.ftl
@@ -153,6 +153,7 @@ pdfjs-document-properties-linearized = Brzi web pregled:
 pdfjs-document-properties-linearized-yes = Da
 pdfjs-document-properties-linearized-no = Ne
 pdfjs-document-properties-close-button = Zatvori
+pdfjs-digital-signature-properties-view-certificate = Pogledaj certifikat
 
 ## Print
 
diff --git a/l10n/sk/viewer.ftl b/l10n/sk/viewer.ftl
index 2fcfcb3435846..0375ed710ffed 100644
--- a/l10n/sk/viewer.ftl
+++ b/l10n/sk/viewer.ftl
@@ -496,8 +496,8 @@ pdfjs-editor-new-alt-text-error-close-button = Zavrieť
 # Variables:
 #   $totalSize (Number) - the total size (in MB) of the AI model.
 #   $downloadedSize (Number) - the downloaded size (in MB) of the AI model.
-pdfjs-editor-new-alt-text-ai-model-downloading-progress = Sťahuje sa model AI pre alternatívne texty ({ $downloadedSize } z { $totalSize } MB)
-    .aria-valuetext = Sťahuje sa model AI pre alternatívne texty ({ $downloadedSize } z { $totalSize } MB)
+pdfjs-editor-new-alt-text-ai-model-downloading-progress = Sťahuje sa model umelej inteligencie pre alternatívne texty ({ $downloadedSize } z { $totalSize } MB)
+    .aria-valuetext = Sťahuje sa model umelej inteligencie pre alternatívne texty ({ $downloadedSize } z { $totalSize } MB)
 # This is a button that users can click to edit the alt text they have already added.
 pdfjs-editor-new-alt-text-added-button =
     .aria-label = Alternatívny text bol pridaný